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Strain distribution of dowel-type connections reinforced with self-tapping screws


Zhang, C and Harris, R and Chang, WS, Strain distribution of dowel-type connections reinforced with self-tapping screws, Journal of Materials in Civil Engineering, 32, (1) Article 04019319. ISSN 0899-1561 (2020) [Refereed Article]

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Copyright 2020. This material may be downloaded for personal use only. Any other use requires prior permission of the American Society of Civil Engineers. This material may be found at

DOI: doi:10.1061/(ASCE)MT.1943-5533.0002883


Current limited guidance on the selection of screws together with undefined design specifications restricts the effectiveness of self-tapping screws as reinforcement on timber members to control crack propagation. Using digital image correlation (DIC), this study visualized the surface strain distribution of screw-reinforced dowel-type connections to understand the influence of thread configuration and screw-to-dowel distance on controlling crack propagation. The experiment was based on single-dowel embedment tests using 16- and 20-mm-diameter steel dowels. Three thread lengths (0%, 33%, and 100% thread) and six screw-to-dowel distances (0.5d, 0.75d, 1d, 1.5d, 2d, and 4d) were investigated. Results show that a screw with 33% thread on the point end can be as effective as screws with 100% thread to control crack propagation under the same geometrical parameters of the connections. Results also reveal that a screw placed further from the dowel (e.g., at 2d distance) can delay the crack-controlling effect. Self-tapping screws placed at 2d can still improve the embedment strength and ductility; however, further doubling this distance (4d) did not enhance the embedment strength, but a higher ductility was still achieved.

Item Details

Item Type:Refereed Article
Keywords:timber, fasteners, timber connections
Research Division:Engineering
Research Group:Civil engineering
Research Field:Construction materials
Objective Division:Construction
Objective Group:Construction materials performance and processes
Objective Field:Timber materials
UTAS Author:Zhang, C (Dr Cong Zhang)
ID Code:139453
Year Published:2020
Web of Science® Times Cited:3
Deposited By:Architecture and Design
Deposited On:2020-06-16
Last Modified:2021-04-07
Downloads:9 View Download Statistics

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